There are 2 types of cable installation: 1) pulling the cable into its path, and 2) placing the cable in its location. The installer installs the cable with conditions that are within the limits of the cable. The overall main principle is to respect installation limits.
During the cable pull, the installer respects 5 installation limits: 1) no twisting, 2) installation load, 3) installation bend radius, 4) installation temperature range, 5) storage temperature range.
No twisting. Avoidance of fiber breakage requires that fiber cables be installed without twisting. To avoid twisting, the installer uses a pulling swivel between the pulling rope and the cable. Attach the pull rope and the cable to the pulling eye.
To comply with the installation load limit, you must know the load limit and have a method for limiting the load applied to the cable. The installer will learn the limit from the data sheet for the cable, creating 2 principles: 1) to Know the installation load limit; & 2) Limit the installation load.
There are 3 methods by which an installer can limit the short-term, or installation, load applied to a cable.
Here are 2 methods for reducing the applied installation load. The 3 methods have the advantage of providing concrete evidence that the installation load has not been exceeded. These methods are the use of 1) a pulling eye with a swivel with a shear pin, 2) a pulling device with a slip clutch, and 3) a pulling device with a load gage. If the installer exceeds the rating, the shear pin breaks. Pullers have two methods to provide such limitation. These methods are a slip clutch and a load gage.
An installer can set the slip clutch of a puller to a level less than the installation load of the cable. Should the applied load exceed the level set, the clutch clips, eliminating fiber damage.